package com.show.controller;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * 替换HttpServlet，根据请求的最后一段路径来进行方法分发
 * @author 绛河
 */
public class BaseServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.获取请求路径
        String uri = request.getRequestURI();// /brand-case/brand/selectAll
        //2.获取最后一段路径，方法名
        int index = uri.lastIndexOf('/');
        String methodName = uri.substring(index + 1);

        //2.执行方法
        //2.1 获取BrandServlet字节码对象Class
        //谁调用我（this 所在的方法），我（this）代表谁
        Class<? extends BaseServlet> cls = this.getClass();
        //2.2 获取Method对象
        try {
            Method method = cls.getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            //2.3 执行方法
            method.invoke(this,request,response);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }


    }
}
